What is the water quality grade for Lake Nina?

Lake Nina in Orange County, Florida received a water quality grade of C (Fair). Water clarity: 4.4 ft visibility. Phosphorus: 23.5 µg/L.

Is Lake Nina safe to swim in?

Generally safe for swimming, moderate water quality. Lake Nina has an overall water quality grade of C. Always check local health department advisories before swimming.

Lake Nina

Orange County, FloridaEutrophic

Lake Nina is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 531 other monitored lakes in Orange County, Lake Nina ranks #316 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-09-23. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 4.4 ft. Phosphorus level: 23.5 µg/L. Trophic State Index: 53.

Metric	Value	Grade
Water Clarity (Secchi Depth)	4.4 ft	D
Phosphorus	23.5 µg/L	B
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	53	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #316 of 532 lakes in Orange County

Cleaner Lakes Within 30 Miles

Lake Nina holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Orange County

More Florida Lake Rankings

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Other Grade C Lakes in Florida

Eastern Lake Outlet

Walton County · Clarity: 4.2 ft

Seminole-Secret Lake

Seminole County · Clarity: 4.5 ft

Spring Lake

Seminole County · Clarity: 2.9 ft

Polk-Fannie Lake

Polk County · Clarity: 3.5 ft

Volusia-North Talmadge Lake

Volusia County · Clarity: 4.5 ft

Seminole-Spring Lake

Seminole County · Clarity: 3 ft

Eutrophic Lakes in Florida

Flagler-Emerald Lake Eastern Lake Outlet Seminole-Secret Lake Ftt Lake

Lake Size & Watershed

Watershed (drainage) area

44 sq mi

Surface area

398 acres

Mean depth (est.)

11.8 ft

Shoreline

5.4 mi

Elevation

72 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.

Regulated Pollution Sources Nearby

1 EPA-permitted facility operate within about 5 miles of Lake Nina under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.

Eatonville, Town Of
Eatonville · 0.5 mi away · NPDES FLS266809
Major

Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.

Data Sources

Water quality data from the EPA Water Quality Portal

Regulated discharger data from EPA ECHO (ICIS-NPDES)

Lake size & watershed from HydroLAKES (HydroSHEDS)

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-09-23

Monitoring stations: 1

Where to stay near Lake Nina

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